Date:	Tue, 11 Dec 2012 14:21:25 -0500
From:	Don Zickus <dzickus@...hat.com>
To:	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Cc:	tglx@...utronix.de
Subject: Re: 3.7 watchdog debugobjects warning

On Tue, Dec 11, 2012 at 01:42:56PM -0500, Dave Jones wrote:
> Looks like we're doing a double-init on a timer.
> 
> I had been experimenting with powertop, so that may have triggered something
> maybe suspend/resume related ?

Is this coming out of a resume then?

I am not familiar with ODEBUG, so I can't really tell what it is
complaining about.

But it seems like the watchdog is being enabled which calls hrtimer_init
to initialize a periodic event.  It seems ODEBUG is complaining that isn't
a good idea for some reason.

Adding Thomas for his opinion.

Cheers,
Don

> 
> (says -rc8, but it's only missing the Makefile change)
> 
> [14844.560489] WARNING: at lib/debugobjects.c:261 debug_print_object+0x8c/0xb0()
> [14844.560919] Hardware name: 2356JK8
> [14844.561133] ODEBUG: init active (active state 0) object type: hrtimer hint: watchdog_timer_fn+0x0/0x190
> [14844.561689] Modules linked in: bluetooth cpufreq_stats iptable_mangle nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack dm_crypt xfs arc4 iwldvm coretemp kvm_intel mac80211 kvm snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_intel snd_hda_codec crc32c_intel iTCO_wdt iTCO_vendor_support snd_hwdep ghash_clmulni_intel snd_seq iwlwifi microcode snd_seq_device pcspkr i2c_i801 snd_pcm cfg80211 tpm_tis e1000e thinkpad_acpi snd_page_alloc lpc_ich snd_timer mfd_core snd soundcore tpm tpm_bios nfsd auth_rpcgss nfs_acl lockd sunrpc btrfs libcrc32c zlib_deflate i915 i2c_algo_bit drm_kms_helper drm i2c_core video
> [14844.565462] Pid: 14, comm: watchdog/0 Not tainted 3.7.0-rc8+ #4
> [14844.565818] Call Trace:
> [14844.565978]  [<ffffffff810529bf>] warn_slowpath_common+0x7f/0xc0
> [14844.566342]  [<ffffffff81052ab6>] warn_slowpath_fmt+0x46/0x50
> [14844.566690]  [<ffffffff8134a0ec>] debug_print_object+0x8c/0xb0
> [14844.567039]  [<ffffffff81104610>] ? watchdog+0x30/0x30
> [14844.567353]  [<ffffffff8134a3df>] __debug_object_init+0x20f/0x3e0
> [14844.567721]  [<ffffffff816a63b9>] ? __schedule+0x479/0xa00
> [14844.568055]  [<ffffffff8134a5cb>] debug_object_init+0x1b/0x20
> [14844.568406]  [<ffffffff81086782>] hrtimer_init+0x32/0x180
> [14844.568735]  [<ffffffff811048f5>] watchdog_enable+0x85/0x200
> [14844.569078]  [<ffffffff810956a1>] ? get_parent_ip+0x11/0x50
> [14844.569416]  [<ffffffff8108cd2c>] smpboot_thread_fn+0x10c/0x300
> [14844.569771]  [<ffffffff8108cc20>] ? __smpboot_create_thread.part.2+0xc0/0xc0
> [14844.570193]  [<ffffffff81081a7d>] kthread+0xed/0x100
> [14844.570496]  [<ffffffff816a5df5>] ? wait_for_common+0x135/0x180
> [14844.570850]  [<ffffffff81081990>] ? kthread_create_on_node+0x160/0x160
> [14844.571243]  [<ffffffff816b0d6c>] ret_from_fork+0x7c/0xb0
> [14844.571570]  [<ffffffff81081990>] ? kthread_create_on_node+0x160/0x160
> [14844.571960] ---[ end trace 482f8371e46ff84f ]---
> 
> 
> Sidenote: At this point, the output in dmesg goes crazy.  Would adding some KERN_CONT's
> have fixed this ?
> 
> 
> 
> [14844.572807] ------------[ cut here ]------------
> [14844.573099] WARNING: at lib/debugobjects.c:261 debug_print_object+0x8c/0xb0()
> [14844.573529] Hardware name: 2356JK8
> [14844.573751] ODEBUG: init active (active state 0) object type: hrtimer hint: watchdog_timer_fn+0x0/0x190
> [14844.576953] ------------[ cut here ]------------
> [14844.576958] WARNING: at lib/debugobjects.c:261 debug_print_object+0x8c/0xb0()
> [14844.576959] Hardware name: 2356JK8
> [14844.576962] ODEBUG: init active (active state 0) object type: hrtimer hint: watchdog_timer_fn+0x0/0x190
> [14844.574316] Modules linked in: bluetooth cpufreq_stats iptable_mangle nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack dm_crypt xfs arc4 iwldvm coretemp kvm_intel mac80211 kvm snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_intel snd_hda_codec crc32c_intel iTCO_wdt iTCO_vendor_support snd_hwdep ghash_clmulni_intel snd_seq iwlwifi microcode snd_seq_device pcspkr i2c_i801 snd_pcm cfg80211 tpm_tis e1000e thinkpad_acpi snd_page_alloc lpc_ich snd_timer mfd_core
> [14844.576962] Modules linked in:
> [14844.576963]  bluetooth
> [14844.576964]  cpufreq_stats
> [14844.576964]  iptable_mangle
> [14844.576965]  nf_conntrack_ipv4
> [14844.576966]  nf_defrag_ipv4
> [14844.576966]  xt_conntrack
> [14844.576967]  nf_conntrack
> [14844.576968]  dm_crypt
> [14844.576968]  xfs
> [14844.576969]  arc4
> [14844.576969]  iwldvm
> [14844.576970]  coretemp
> [14844.576971]  kvm_intel
> [14844.576971]  mac80211
> [14844.576972]  kvm
> [14844.576972]  snd_hda_codec_hdmi
> [14844.576973]  snd_hda_codec_realtek
> [14844.576974]  snd_hda_intel
> [14844.576974]  snd_hda_codec
> [14844.576975]  crc32c_intel
> [14844.576975]  iTCO_wdt
> [14844.576976]  iTCO_vendor_support
> [14844.576977]  snd_hwdep
> [14844.576977]  ghash_clmulni_intel
> [14844.576978]  snd_seq
> [14844.576978]  iwlwifi
> [14844.576979]  microcode
> [14844.576980]  snd_seq_device
> [14844.576980]  pcspkr
> [14844.576981]  i2c_i801
> [14844.576981]  snd_pcm
> [14844.576982]  cfg80211
> [14844.576983]  tpm_tis
> [14844.576983]  e1000e
> [14844.576984]  thinkpad_acpi
> [14844.576984]  snd_page_alloc
> [14844.576985]  lpc_ich
> [14844.576985]  snd_timer
> [14844.576986]  mfd_core
> [14844.576987]  snd
> [14844.576987]  soundcore
> [14844.576988]  tpm
> [14844.576989]  tpm_bios
> [14844.576989]  nfsd
> [14844.576990]  auth_rpcgss
> [14844.576990]  nfs_acl
> [14844.576991]  lockd
> [14844.576992]  sunrpc
> [14844.576992]  btrfs
> [14844.576993]  libcrc32c
> [14844.576994]  zlib_deflate
> [14844.576994]  i915
> [14844.576995]  i2c_algo_bit
> [14844.576996]  drm_kms_helper
> [14844.576996]  drm
> [14844.576997]  i2c_core
> [14844.576998]  video
> 
> [14844.577000] Pid: 21, comm: watchdog/2 Tainted: G        W    3.7.0-rc8+ #4
> [14844.577001] Call Trace:
> 
> [14844.577005]  [<ffffffff810529bf>] warn_slowpath_common+0x7f/0xc0
> 
> [14844.577008]  [<ffffffff81052ab6>] warn_slowpath_fmt+0x46/0x50
> 
> [14844.577011]  [<ffffffff8134a0ec>] debug_print_object+0x8c/0xb0
> 
> [14844.577013]  [<ffffffff81104610>] ? watchdog+0x30/0x30
> 
> [14844.577015]  [<ffffffff8134a3df>] __debug_object_init+0x20f/0x3e0
> 
> [14844.577018]  [<ffffffff816a63b9>] ? __schedule+0x479/0xa00
> [14844.577018] ------------[ cut here ]------------
> 
> [14844.577021] WARNING: at lib/debugobjects.c:261 debug_print_object+0x8c/0xb0()
> [14844.577023]  [<ffffffff8134a5cb>] debug_object_init+0x1b/0x20
> [14844.577023] Hardware name: 2356JK8
> 
> [14844.577026] ODEBUG: init active (active state 0) object type: hrtimer hint: watchdog_timer_fn+0x0/0x190
> [14844.577028]  [<ffffffff81086782>] hrtimer_init+0x32/0x180
> [14844.577029] Modules linked in:
> 
> [14844.577029]  bluetooth
> [14844.577031]  [<ffffffff811048f5>] watchdog_enable+0x85/0x200
> [14844.577031]  cpufreq_stats
> 
> [14844.577032]  iptable_mangle
> [14844.577034]  [<ffffffff810956a1>] ? get_parent_ip+0x11/0x50
> [14844.577035]  nf_conntrack_ipv4
> 
> [14844.577036]  nf_defrag_ipv4
> [14844.577037]  [<ffffffff8108cd2c>] smpboot_thread_fn+0x10c/0x300
> [14844.577038]  xt_conntrack
> 
> [14844.577038]  nf_conntrack
> [14844.577040]  [<ffffffff8108cc20>] ? __smpboot_create_thread.part.2+0xc0/0xc0
> [14844.577040]  dm_crypt
> 
> [14844.577041]  xfs
> [14844.577043]  [<ffffffff81081a7d>] kthread+0xed/0x100
> [14844.577043]  arc4
> 
> [14844.577044]  iwldvm
> [14844.577045]  [<ffffffff816a5df5>] ? wait_for_common+0x135/0x180
> [14844.577046]  coretemp
> 
> [14844.577047]  kvm_intel
> [14844.577048]  [<ffffffff81081990>] ? kthread_create_on_node+0x160/0x160
> [14844.577049]  mac80211
> 
> [14844.577049]  kvm
> [14844.577051]  [<ffffffff816b0d6c>] ret_from_fork+0x7c/0xb0
> [14844.577052]  snd_hda_codec_hdmi
> 
> [14844.577052]  snd_hda_codec_realtek
> [14844.577054]  [<ffffffff81081990>] ? kthread_create_on_node+0x160/0x160
> [14844.577054]  snd_hda_intel
> [14844.577055] ---[ end trace 482f8371e46ff850 ]---
> [14844.577055]  snd_hda_codec
> [14844.577056]  crc32c_intel
> [14844.577057]  iTCO_wdt
> [14844.577057]  iTCO_vendor_support
> [14844.577058]  snd_hwdep
> [14844.577058]  ghash_clmulni_intel
> [14844.577059]  snd_seq
> [14844.577059]  iwlwifi
> [14844.577060]  microcode
> [14844.577060]  snd_seq_device
> [14844.577061]  pcspkr
> [14844.577062]  i2c_i801
> [14844.577062]  snd_pcm
> [14844.577063]  cfg80211
> [14844.577063]  tpm_tis
> [14844.577064]  e1000e
> [14844.577064]  thinkpad_acpi
> [14844.577065]  snd_page_alloc
> [14844.577066]  lpc_ich
> [14844.577066]  snd_timer
> [14844.577067]  mfd_core
> [14844.577067]  snd
> [14844.577068]  soundcore
> [14844.577068]  tpm
> [14844.577069]  tpm_bios
> [14844.577070]  nfsd
> [14844.577070]  auth_rpcgss
> [14844.577071]  nfs_acl
> [14844.577071]  lockd
> [14844.577072]  sunrpc
> [14844.577072]  btrfs
> [14844.577073]  libcrc32c
> [14844.577074]  zlib_deflate
> [14844.577074]  i915
> [14844.577075]  i2c_algo_bit
> [14844.577075]  drm_kms_helper
> [14844.577076]  drm
> [14844.577076]  i2c_core
> [14844.577077]  video
> 
> [14844.577079] Pid: 27, comm: watchdog/3 Tainted: G        W    3.7.0-rc8+ #4
> [14844.577079] Call Trace:
> 
> [14844.577082]  [<ffffffff810529bf>] warn_slowpath_common+0x7f/0xc0
> 
> [14844.577084]  [<ffffffff81052ab6>] warn_slowpath_fmt+0x46/0x50
> 
> [14844.577087]  [<ffffffff8134a0ec>] debug_print_object+0x8c/0xb0
> 
> [14844.577089]  [<ffffffff81104610>] ? watchdog+0x30/0x30
> 
> [14844.577091]  [<ffffffff8134a3df>] __debug_object_init+0x20f/0x3e0
> 
> [14844.577093]  [<ffffffff816a63b9>] ? __schedule+0x479/0xa00
> 
> [14844.577095]  [<ffffffff8134a5cb>] debug_object_init+0x1b/0x20
> 
> [14844.577097]  [<ffffffff81086782>] hrtimer_init+0x32/0x180
> 
> [14844.577100]  [<ffffffff811048f5>] watchdog_enable+0x85/0x200
> 
> [14844.577102]  [<ffffffff810956a1>] ? get_parent_ip+0x11/0x50
> 
> [14844.577104]  [<ffffffff8108cd2c>] smpboot_thread_fn+0x10c/0x300
> 
> [14844.577106]  [<ffffffff8108cc20>] ? __smpboot_create_thread.part.2+0xc0/0xc0
> 
> [14844.577108]  [<ffffffff81081a7d>] kthread+0xed/0x100
> 
> [14844.577110]  [<ffffffff816a5d0a>] ? wait_for_common+0x4a/0x180
> 
> [14844.577112]  [<ffffffff81081990>] ? kthread_create_on_node+0x160/0x160
> 
> [14844.577114]  [<ffffffff816b0d6c>] ret_from_fork+0x7c/0xb0
> 
> [14844.577115]  [<ffffffff81081990>] ? kthread_create_on_node+0x160/0x160
> [14844.577116] ---[ end trace 482f8371e46ff851 ]---
> [14844.599738]  snd
> [14844.599856]  soundcore tpm tpm_bios nfsd auth_rpcgss nfs_acl lockd sunrpc btrfs libcrc32c zlib_deflate i915 i2c_algo_bit drm_kms_helper drm i2c_core video
> [14844.600705] Pid: 15, comm: watchdog/1 Tainted: G        W    3.7.0-rc8+ #4
> [14844.601082] Call Trace:
> [14844.601224]  [<ffffffff810529bf>] warn_slowpath_common+0x7f/0xc0
> [14844.601555]  [<ffffffff81052ab6>] warn_slowpath_fmt+0x46/0x50
> [14844.601879]  [<ffffffff8134a0ec>] debug_print_object+0x8c/0xb0
> [14844.602208]  [<ffffffff81104610>] ? watchdog+0x30/0x30
> [14844.602501]  [<ffffffff8134a3df>] __debug_object_init+0x20f/0x3e0
> [14844.602843]  [<ffffffff816a63b9>] ? __schedule+0x479/0xa00
> [14844.603147]  [<ffffffff8134a5cb>] debug_object_init+0x1b/0x20
> [14844.603463]  [<ffffffff81086782>] hrtimer_init+0x32/0x180
> [14844.603761]  [<ffffffff811048f5>] watchdog_enable+0x85/0x200
> [14844.604077]  [<ffffffff810956a1>] ? get_parent_ip+0x11/0x50
> [14844.604388]  [<ffffffff8108cd2c>] smpboot_thread_fn+0x10c/0x300
> [14844.604717]  [<ffffffff8108cc20>] ? __smpboot_create_thread.part.2+0xc0/0xc0
> [14844.605104]  [<ffffffff81081a7d>] kthread+0xed/0x100
> [14844.605381]  [<ffffffff816a5d0a>] ? wait_for_common+0x4a/0x180
> [14844.605704]  [<ffffffff81081990>] ? kthread_create_on_node+0x160/0x160
> [14844.606070]  [<ffffffff816b0d6c>] ret_from_fork+0x7c/0xb0
> [14844.606367]  [<ffffffff81081990>] ? kthread_create_on_node+0x160/0x160
> [14844.606728] ---[ end trace 482f8371e46ff852 ]---
> 
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